Well you need to be a bit more specific. If you want help on using the engine then you should read the manual that is included with CS (and also available online on the site) and also the various tutorials that you can find on the site.

I recommend starting with those. Explaining how CS works would basically mean I just have to copy the manual here and I think it is more efficient if you go read it at the appropriate location.

I don't know what is happening so could you please tell me how to install and compile CS step by step?

But this step by step explanation is exactly in the manual. The only thing I can do is copy/paste that here but that doesn't make sense. Just go read it in the manual. I cannot add any information to what is already in the manual.

Sorry but that's a lot of work. The steps are clearly described in the manual. You can just read them there and follow them step by step. If you encounter problems with a particular step just tell it here.